From: Mikael Holm (mikael.holm_at_se.danskebank.com)
Date: 2003-01-29 11:01:18
Hej Ruud,
I have to agree with you... A dual-assembler would probably be the wrong
tool... But the C128 CP/M BDOS has the standard USER service call that
calls the C128 CP/M BIOS (as do most other service calls) and I have read
about a subfunction of this USER service call that lets you enter
8502-mode, call 8502 code and return to CP/M afterwards. My problem is
that the doc's I have doesn't say how to call this USER function and how I
would go about telling it where I have some 8502 code it can execute... I
think that my CP/M program must transfer the 8502 code (from within itself
or from file?) to a safe location (wherever there is free C128 memory
under the Z80 ROM) and execute it from there?
About writing a driver... Do you have any doc, hints, links or samples of
how to do this?
//Mikael
Hallo Mikael, Anders,
> But doing it this way is just good in native 128 mode or "native"
> z80 mode, not under CP/M.
+
> would it be possible to link those two
> together into one C compiler which could optimize and do neccessary
> processor switching automatically?
The idea of CP/M is that it can be used on every CP/M-computer. This is
done by calling BIOS-routines when machine dependant actions are needed
like loading from disk. So when only writing programs to run under CP/M,
using a dual-assembler is not prefered.
Writing a driver is another question of course.
> Another other 6502 + Z80 setup?
SuperPET: 6502 and 6809
Apple ][: idem
Lately there was a Apple ][-clone with e 6502, Z80 and 6809 ONBOARD (!!!)
for sale on Ebay.
I myself own a Z80-card for a PET/CBM. No idea who made it, no software
etc... :(
--
___
/ __|__
/ / |_/ Groetjes, Ruud
\ \__|_\
\___| http://Ruud.C64.org
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